单项选择题

As a last resort，a tourniquet can be used to（）.

A.hold a victim in a stretcher
B.stop uncontrolled bleeding
C.hold a large bandage in place
D.restrain a delirious victim

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An uncontrolled flow of gas，oil，or other well fluids into the atmosphere is called a（）.

A.flow
B.breakout
C.kick
D.blowout
单项选择题
All the traces are（）old ones.

A.clear
B.evident
C.obvious
D.apparently
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